Digital carrier recovery with adaptive dual loop DPLL for mobile communication applications

  • Authors:

  • Beomsup Kim

  • Affiliations:

  • Philips Research, Palo Alto, Palo Alto, CA

  • Venue:
  • ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: digital speech processing - Volume III
  • Year:
  • 1993

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Abstract

A salient digital carrier recovery technique with an adaptive dual loop digital phase-locked loop (DPLL) for mobile communication applications is presented in this paper. The dual-loop DPLL adjusts its control parameters adaptively according to input noise and phase fluctuations based on the recursive least square criterion. This technique requires only moderate computational complexity and memory space, but it still tracks phase fluctuation effectively and reduces the input jitter within allowable jitter tolerance. Also, since it achieves fast initial acquisition of frequency and phase without a limitation of pull-in range, it enables fart carrier switching. Finally, the dual loop DPLL allows robust stability and bandwidth control and achieves zero static phase offset for step input frequency changes.